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Reusable filtration units include two membrane support plates: a one-piece clear plate for sterilization applications and a two-piece white plate for analytical applications. Accepts 47 or 50 mm diameter membranes. Two side paths allow connection to the vacuum line. Adapters accept vacuum tubing from 1/4 to 5/16 inch (6 to 8 mm) inner diameter. 4 units per container.